An optical multichannel curve reader

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Abstract
To perform mathematical operations on data available as graphic recordings, an apparatus has been developed for the recovery of analogue signals from the recording itself. This device, based on repetitive optical reflection scanning, is capable of simultaneously processing up to eight curves drawn on the same chart. The useful operating area is 27 cm*45 cm, but simple modifications can be introduced to treat strip chart recordings. The electronics used for data conversion are partly digital and use sampling techniques. Special provisions have been introduced to minimize noise problems during the trace detection process. Traces down to 0.5 mm in width are easily detected and the overall accuracy is better than 1 mm.

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